[Gluster-devel] gfid and volume-id extended attributes lost

[Ankireddypalle Reddy]

Pranith,
                 Thanks for looking in to the issue. The bricks were mounted after the reboot. One more thing that I noticed was when the attributes were manually set when glusterd was up then on starting the volume the attributes were again lost. Had to stop glusterd set attributes and then start glusterd. After that the volume start succeeded.

Thanks and Regards,
Ram

From: Pranith Kumar Karampuri [mailto:pkarampu at redhat.com]
Sent: Friday, July 07, 2017 11:46 AM
To: Ankireddypalle Reddy
Cc: Gluster Devel (gluster-devel at gluster.org); gluster-users at gluster.org
Subject: Re: [Gluster-devel] gfid and volume-id extended attributes lost

Did anything special happen on these two bricks? It can't happen in the I/O path:
posix_removexattr() has:
  0         if (!strcmp (GFID_XATTR_KEY, name)) {
  1                 gf_msg (this->name, GF_LOG_WARNING, 0, P_MSG_XATTR_NOT_REMOVED,
  2                         "Remove xattr called on gfid for file %s", real_path);
  3                 op_ret = -1;
  4                 goto out;
  5         }
  6         if (!strcmp (GF_XATTR_VOL_ID_KEY, name)) {
  7                 gf_msg (this->name, GF_LOG_WARNING, 0, P_MSG_XATTR_NOT_REMOVED,
  8                         "Remove xattr called on volume-id for file %s",
  9                         real_path);
 10                 op_ret = -1;
 11                 goto out;
 12         }
I just found that op_errno is not set correctly, but it can't happen in the I/O path, so self-heal/rebalance are off the hook.
I also grepped for any removexattr of trusted.gfid from glusterd and didn't find any.
So one thing that used to happen was that sometimes when machines reboot, the brick mounts wouldn't happen and this would lead to absence of both trusted.gfid and volume-id. So at the moment this is my wild guess.


On Fri, Jul 7, 2017 at 8:39 PM, Ankireddypalle Reddy <areddy at commvault.com<mailto:areddy at commvault.com>> wrote:
Hi,
       We faced an issue in the production today. We had to stop the volume and reboot all the servers in the cluster.  Once the servers rebooted starting of the volume failed because the following extended attributes were not present on all the bricks on 2 servers.

1)      trusted.gfid

2)      trusted.glusterfs.volume-id

We had to manually set these extended attributes to start the volume.  Are there any such known issues.

Thanks and Regards,
Ram
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--
Pranith
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